Puppy Weight Calculator

How accurate is a puppy weight calculator?

It is a rough extrapolation, not a guarantee. Genetics, neuter timing, diet, and activity all shift final size—use results for planning and confirm with your vet.

Why use 52 weeks?

Many planning tools treat one year as a handy horizon for medium dogs. Large and giant breeds often gain weight after 52 weeks; our disclaimer notes that limit.

What if I do not know the breed?

Pick the adult size group that matches the parents or your vet’s guess. Recalculate as your puppy grows and the picture becomes clearer.

Is doubling at 16 weeks the same as this?

Doubling at 16 weeks is a popular rule of thumb for medium puppies (~16 lb → ~32 lb). This tool generalises by age and size category instead of a single milestone.

Many owners extrapolate puppy weight to a 52-week adult size, then adjust for breed category. This calculator applies that common planning formula with a size factor for toy through giant dogs.

• Enter your puppy’s age in weeks (6–52).
• Add current weight in pounds or kilograms from a home or vet scale.
• Choose the expected adult size group that fits your breed.
• Tap Estimate adult weight for lb/kg projection and a ±10% planning band.

• Choosing a crate or bed before your dog finishes growing.
• Rough food-budget planning by expected adult size.
• Tracking mixed-breed puppies when adult size is uncertain.
• Comparing two weigh-ins a few weeks apart to see if projections shift.

1. 12 weeks, 10 lb, medium → about 43 lb adult (≈19.5 kg); range roughly 39–48 lb.
2. 16 weeks, 8 kg, large → about 26 kg adult (≈57 lb) before size adjustment.
3. 20 weeks, 5 lb, toy → higher size factor → adult estimate above simple doubling—check the result panel.